|
|
A022277
|
|
a(n) = n*(19*n + 1)/2.
|
|
3
|
|
|
0, 10, 39, 87, 154, 240, 345, 469, 612, 774, 955, 1155, 1374, 1612, 1869, 2145, 2440, 2754, 3087, 3439, 3810, 4200, 4609, 5037, 5484, 5950, 6435, 6939, 7462, 8004, 8565, 9145, 9744, 10362, 10999, 11655, 12330, 13024, 13737, 14469, 15220, 15990, 16779, 17587, 18414
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
|
|
MATHEMATICA
|
CoefficientList[Series[x (10 + 9 x) / (1 - x)^3, {x, 0, 40}], x] (* Vincenzo Librandi, Mar 31 2015 *)
LinearRecurrence[{3, -3, 1}, {0, 10, 39}, 50] (* Harvey P. Dale, May 02 2021 *)
|
|
PROG
|
|
|
CROSSREFS
|
Cf. similar sequences listed in A022289.
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|